NAME
    issq - whether a value is a square

SYNOPSIS
    issq(x)

TYPES
    x		real

    return	int

DESCRIPTION
    Determine if x is a square.	 If there exists integers a, b such that:

	x == a^2 / b^2		(b != 0)

    return 1, otherwise return 0.

EXAMPLE
    > print issq(25), issq(3), issq(0)
    1 0 1

    > print issq(4/25), issq(-4/25), issq(pi())
    1 0 0

LIMITS
    none

LIBRARY
    BOOL qissquare(NUMBER *x)
    BOOL zissquare(ZVALUE x)

SEE ALSO
    isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
    ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
    isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
    issimple, isstr, istype